Ignore empty extra lines in train.txt

src/data.c

@@ -46,10 +46,12 @@ char **get_random_paths(char **paths, int n, int m)
     pthread_mutex_lock(&mutex);
 	//printf("n = %d \n", n);
     for(i = 0; i < n; ++i){
+		do {
 			int index = random_gen() % m;
 			random_paths[i] = paths[index];
 			//if(i == 0) printf("%s\n", paths[index]);
 			//printf("grp: %s\n", paths[index]);
+		} while (strlen(random_paths[i]) == 0);
     }
     pthread_mutex_unlock(&mutex);
     return random_paths;